Energy MetabolismEnergy IntakeEnergy TransferPositron-Emission TomographyOtoacoustic Emissions, SpontaneousTomography, Emission-ComputedVehicle EmissionsFluorodeoxyglucose F18RadiopharmaceuticalsConservation of Energy ResourcesTomography, Emission-Computed, Single-PhotonFluorescence Resonance Energy TransferSpectrometry, FluorescenceGreenhouse EffectSolar EnergyThermodynamicsFluorine RadioisotopesRenewable EnergyCarbon FootprintMethaneEnergy-Generating ResourcesAir PollutantsFluorescent DyesFossil FuelsBrainBasal MetabolismFluorescenceMultimodal ImagingEnergy DrinksAtmosphereKineticsTomography, X-Ray ComputedCarbon RadioisotopesTime FactorsVolatilizationTemperaturePentanesEatingModels, MolecularCalorimetry, IndirectBody WeightEnvironmental MonitoringCarbon DioxidePhotonsModels, ChemicalSpectrometry, X-Ray EmissionModels, TheoreticalModels, BiologicalGasolineOxygen ConsumptionComputer SimulationGlucoseLuminescenceWaterCoalPower PlantsNitrogenLuminescent MeasurementsBody CompositionCarbonGasesSensitivity and SpecificityProtein ConformationDietary ProteinsVolatile Organic CompoundsNitrous OxideCerebrovascular CirculationDenitrificationManureMagnetic Resonance ImagingAdenosine TriphosphateAnimal FeedReproducibility of ResultsDietary FatsHydrogen-Ion ConcentrationCalorimetryAlgorithmsQuantum TheoryImage Processing, Computer-AssistedDeoxyglucoseAir PollutionLightOrganotechnetium CompoundsDietary CarbohydratesOxidation-ReductionLinear Energy TransferAmmoniaCochleaProtein BindingSpectrum AnalysisElectronsBioelectric Energy SourcesRadioisotopesFeeding BehaviorBiofuelsTryptophanFluorescence PolarizationThallium RadioisotopesRadioactive TracersPhantoms, Imaging